from django.db import models

class Area(models.Model):
    name = models.CharField(max_length=20, verbose_name="区域")
    parent = models.ForeignKey('self',
                               on_delete=models.SET_NULL,
                               related_name='subs',
                               null=True,
                               blank=True,
                               verbose_name='上级区域'
                               )
    class Meta:
        db_table = "tb_areas"

    def __str__(self):
        return self.name


